text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
  
  // <chrono>
  // class year_month_day;
  
  //  year_month_day() = default;
  //  constexpr year_month_day(const chrono::year& y, const chrono::month& m,
  //                                   const chrono::day& d) noexcept;
  //
  //  Effects:  Constructs an object of type year_month_day by initializing
  //                y_ with y, m_ with m, and d_ with d.
  //
  //  constexpr chrono::year   year() const noexcept;
  //  constexpr chrono::month month() const noexcept;
  //  constexpr chrono::day     day() const noexcept;
  //  constexpr bool             ok() const noexcept;
  
  #include <chrono>
  #include <type_traits>
  #include <cassert>
  
  #include "test_macros.h"
  
  int main()
  {
      using year           = std::chrono::year;
      using month          = std::chrono::month;
      using day            = std::chrono::day;
      using year_month_day = std::chrono::year_month_day;
  
      ASSERT_NOEXCEPT(year_month_day{});
      ASSERT_NOEXCEPT(year_month_day{year{1}, month{1}, day{1}});
      
      constexpr month January = std::chrono::January;
      
      constexpr year_month_day ym0{};
      static_assert( ym0.year()  == year{},  "");
      static_assert( ym0.month() == month{}, "");
      static_assert( ym0.day()   == day{},   "");
      static_assert(!ym0.ok(),               "");
  
      constexpr year_month_day ym1{year{2019}, January, day{12}};
      static_assert( ym1.year()  == year{2019}, "");
      static_assert( ym1.month() == January,    "");
      static_assert( ym1.day()   == day{12},    "");
      static_assert( ym1.ok(),                  "");
  
  }
  